'use strict';

const autoprefixer = require('autoprefixer');
const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CaseSensitivePathsPlugin = require('case-sensitive-paths-webpack-plugin');
const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
const WatchMissingNodeModulesPlugin = require('react-dev-utils/WatchMissingNodeModulesPlugin');
const eslintFormatter = require('react-dev-utils/eslintFormatter');
const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');
const ExtractTextPlugin = require("extract-text-webpack-plugin");
const getClientEnvironment = require('./env');
const paths = require('./paths');
function resolve (dir) {
  return path.join(__dirname, '..', dir)
}
// Webpack uses `publicPath` to determine where the app is being served from. In
// development, we always serve from the root. This makes config easier.
const publicPath = '/';
// `publicUrl` is just like `publicPath`, but we will provide it to our app as
// %PUBLIC_URL% in `index.html` and `process.env.PUBLIC_URL` in JavaScript. Omit
// trailing slash as %PUBLIC_PATH%/xyz looks better than %PUBLIC_PATH%xyz.
const publicUrl = '';
// Get environment variables to inject into our app.
const env = getClientEnvironment(publicUrl);
const extractLess = new ExtractTextPlugin({
  filename: "[name].[contenthash].css",
  // disable: process.env.NODE_ENV === "development"
});
// This is the development configuration. It is focused on developer experience
// and fast rebuilds. The production configuration is different and lives in a
// separate file.
module.exports = {
  // You may want 'eval' instead if you prefer to see the compiled output in
  // DevTools. See the discussion in
  // https://github.com/facebookincubator/create-react-app/issues/343.
  devtool: 'cheap-module-source-map',
  // These are the "entry points" to our application. This means they will be the
  // "root" imports that are included in JS bundle. The first two entry points
  // enable "hot" CSS and auto-refreshes for JS.
  entry: [
    // We ship a few polyfills by default:
    require.resolve('./polyfills'),
    // Include an alternative client for WebpackDevServer. A client's job is to
    // connect to WebpackDevServer by a socket and get notified about changes. When
    // you save a file, the client will either apply hot updates (in case of CSS
    // changes), or refresh the page (in case of JS changes). When you make a syntax
    // error, this client will display a syntax error overlay.
    // Note: instead of the default WebpackDevServer client, we use a custom one to
    // bring better experience for Create React App users. You can replace the line
    // below with these two lines if you prefer the stock client:
    // require.resolve('webpack-dev-server/client') + '?/',
    // require.resolve('webpack/hot/dev-server'),
    require.resolve('react-dev-utils/webpackHotDevClient'),
    // Finally, this is your app's code:
    paths.appIndexJs,
    // We include the app code last so that if there is a runtime error during
    // initialization, it doesn't blow up the WebpackDevServer client, and changing
    // JS code would still trigger a refresh.
  ],
  output: {
    // Add /* filename */ comments to generated require()s in the output.
    pathinfo: true,
    // This does not produce a real file. It's just the virtual path that is served
    // by WebpackDevServer in development. This is the JS bundle containing code
    // from all our entry points, and the Webpack runtime.
    filename: 'static/js/bundle.js',
    // There are also additional JS chunk files if you use code splitting.
    chunkFilename: 'static/js/[name].chunk.js',
    // This is the URL that app is served from. We use "/" in development.
    publicPath: publicPath,
    // Point sourcemap entries to original disk location (format as URL on Windows)
    devtoolModuleFilenameTemplate: info => path
      .resolve(info.absoluteResourcePath)
      .replace(/\\/g, '/')
  },
  resolve: {
    // This allows you to set a fallback for where Webpack should look for modules.
    // We placed these paths second because we want `node_modules` to "win" if
    // there are any conflicts. This matches Node resolution mechanism.
    // https://github.com/facebookincubator/create-react-app/issues/253
    modules: ['node_modules', paths.appNodeModules].concat(
    // It is guaranteed to exist because we tweak it in `env.js`
    process.env.NODE_PATH.split(path.delimiter).filter(Boolean)),
    // These are the reasonable defaults supported by the Node ecosystem. We also
    // include JSX as a common component filename extension to support some tools,
    // although we do not recommend using it, see:
    // https://github.com/facebookincubator/create-react-app/issues/290 `web`
    // extension prefixes have been added for better support for React Native Web.
    extensions: [
      '.web.js',
      '.mjs',
      '.js',
      '.json',
      '.web.jsx',
      '.jsx'
    ],
    alias: {
      'react-native': 'react-native-web',
      'img': resolve('src/assets/img')
    },
    plugins: [// Prevents users from importing files from outside of src/ (or node_modules/).
      // This often causes confusion because we only process files within src/ with
      // babel. To fix this, we prevent you from importing files out of src/ -- if
      // you'd like to, please link the files into your node_modules/ and let
      // module-resolution kick in. Make sure your source files are compiled, as they
      // will not be processed in any way.
      new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson])]
  },
  module: {
    strictExportPresence: true,
    rules: [
      // TODO: Disable require.ensure as it's not a standard language feature. We are
      // waiting for
      // https://github.com/facebookincubator/create-react-app/issues/2176. { parser:
      // { requireEnsure: false } }, First, run the linter. It's important to do this
      // before Babel processes the JS.
      {
        test: /\.(js|jsx|mjs)$/,
        enforce: 'pre',
        use: [
          {
            options: {
              formatter: eslintFormatter,
              eslintPath: require.resolve('eslint')
            },
            loader: require.resolve('eslint-loader')
          }
        ],
        include: paths.appSrc
      }, {
        // "oneOf" will traverse all following loaders until one will match the
        // requirements. When no loader matches it will fall back to the "file" loader
        // at the end of the loader list.
        oneOf: [
          // "url" loader works like "file" loader except that it embeds assets smaller
          // than specified limit in bytes as data URLs to avoid requests. A missing
          // `test` is equivalent to a match.
          {
            test: [
              /\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/
            ],
            use: [
              {
                loader: require.resolve('url-loader'),
                options: {
                  limit: 10000,
                  name: 'static/media/[name].[hash:8].[ext]'
                }
              }

            ]
          },
          // Process JS with Babel.
          {
            test: /\.(js|jsx|mjs)$/,
            include: paths.appSrc,
            loader: require.resolve('babel-loader'),
            options: {

              // This is a feature of `babel-loader` for webpack (not Babel itself). It
              // enables caching results in ./node_modules/.cache/babel-loader/ directory for
              // faster rebuilds.
              cacheDirectory: true
            }
          },
          // "postcss" loader applies autoprefixer to our CSS. "css" loader resolves paths
          // in CSS and adds assets as dependencies. "style" loader turns CSS into JS
          // modules that inject <style> tags. In production, we use a plugin to extract
          // that CSS to a file, but in development "style" loader enables hot editing of
          // CSS.
          {
            test: /\.css$/,
            use: [
              require.resolve('style-loader'), {
                loader: require.resolve('css-loader'),
                options: {
                  importLoaders: 1
                }
              }, {
                loader: require.resolve('postcss-loader'),
                options: {
                  // Necessary for external CSS imports to work
                  // https://github.com/facebookincubator/create-react-app/issues/2677
                  ident: 'postcss',
                  plugins: () => [
                    require('postcss-flexbugs-fixes'),
                    autoprefixer({
                      browsers: [
                        '>1%', 'last 4 versions', 'Firefox ESR', 'not ie < 9', // React doesn't support IE8 anyway
                      ],
                      flexbox: 'no-2009'
                    })
                  ]
                }
              }
            ]
          }, {
            test: /\.less$/,
            use: extractLess.extract({
              use: [
                {
                  loader: require.resolve('css-loader')
                }, {
                  loader: require.resolve('less-loader')
                }
              ],
              // use style-loader in development
              fallback: require.resolve('style-loader')
            })
          },
          // "file" loader makes sure those assets get served by WebpackDevServer. When
          // you `import` an asset, you get its (virtual) filename. In production, they
          // would get copied to the `build` folder. This loader doesn't use a "test" so
          // it will catch all modules that fall through the other loaders.
          {
            // Exclude `js` files to keep "css" loader working as it injects it's runtime
            // that would otherwise processed through "file" loader. Also exclude `html` and
            // `json` extensions so they get processed by webpacks internal loaders.
            exclude: [
              /\.js$/, /\.html$/, /\.json$/
            ],
            loader: require.resolve('file-loader'),
            options: {
              name: 'static/media/[name].[hash:8].[ext]'
            }
          }
        ]
      },
      // ** STOP ** Are you adding a new loader? Make sure to add the new loader(s)
      // before the "file" loader.
    ]
  },
  plugins: [
    extractLess,
    // Makes some environment variables available in index.html. The public URL is
    // available as %PUBLIC_URL% in index.html, e.g.: <link rel="shortcut icon"
    // href="%PUBLIC_URL%/favicon.ico"> In development, this will be an empty
    // string.
    new InterpolateHtmlPlugin(env.raw),
    // Generates an `index.html` file with the <script> injected.
    new HtmlWebpackPlugin({inject: true, template: paths.appHtml}),
    // Add module names to factory functions so they appear in browser profiler.
    new webpack.NamedModulesPlugin(),
    // Makes some environment variables available to the JS code, for example: if
    // (process.env.NODE_ENV === 'development') { ... }. See `./env.js`.
    new webpack.DefinePlugin(env.stringified),
    // This is necessary to emit hot updates (currently CSS only):
    new webpack.HotModuleReplacementPlugin(),
    // Watcher doesn't work well if you mistype casing in a path so we use a plugin
    // that prints an error when you attempt to do this. See
    // https://github.com/facebookincubator/create-react-app/issues/240
    new CaseSensitivePathsPlugin(),
    // If you require a missing module and then `npm install` it, you still have to
    // restart the development server for Webpack to discover it. This plugin makes
    // the discovery automatic so you don't have to restart. See
    // https://github.com/facebookincubator/create-react-app/issues/186
    new WatchMissingNodeModulesPlugin(paths.appNodeModules),
    // Moment.js is an extremely popular library that bundles large locale files by
    // default due to how Webpack interprets its code. This is a practical solution
    // that requires the user to opt into importing specific locales.
    // https://github.com/jmblog/how-to-optimize-momentjs-with-webpack You can
    // remove this if you don't use Moment.js:
    new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/)
  ],
  // Some libraries import Node modules but don't use them in the browser. Tell
  // Webpack to provide empty mocks for them so importing them works.
  node: {
    dgram: 'empty',
    fs: 'empty',
    net: 'empty',
    tls: 'empty',
    child_process: 'empty'
  },
  // Turn off performance hints during development because we don't do any
  // splitting or minification in interest of speed. These warnings become
  // cumbersome.
  performance: {
    hints: false
  }
};
